package com.bwie.filter;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.concurrent.TimeUnit;

@Component
public class MyFilter implements GlobalFilter {

    @Autowired
    StringRedisTemplate redisTemplate;

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        String url = request.getURI().getPath();
        System.out.println("路径：" + url);

        if (url.contains("/login")) {
            System.out.println("百名单：" + url);
            return chain.filter(exchange);
        }

        String token = request.getHeaders().getFirst("token");
        if (token == null) {
            System.out.println("token为空：" + url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        Claims body = Jwts.parser().setSigningKey("123456").parseClaimsJws(token).getBody();
        Integer userId = body.get("userId", Integer.class);

        String key = "token" + userId;

        String redisToken = redisTemplate.opsForValue().get(key);
        if (!redisToken.equals(token)) {
            System.out.println("缓存token与头部token不一致：" + url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        if (redisToken == null) {
            System.out.println("缓存token过期:" + url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        // 为token续期
        redisTemplate.expire(key, 45, TimeUnit.MINUTES);

        // 放行
        return chain.filter(exchange);
    }
}
